Group 1

YYG1G1/

YY: Day of the month

G1G1 : Time of commencement of forecast (UTC). Midnight is encoded as 00.

Group 2

0AAAam

The maritime area to which the whole forecast or set of forecasts refers. If the geographical name for the forecast region is used instead of the indicator AAAam, it shall be inserted at the place of this group.

Group 2

am Code

Portion of the Maritime Area

0

Whole of the area AAA

1

Northeast quadrant of the area AAA

2

Eastern half of the area AAA

3

Southeast quadrant of the area

4

Southern half of the area AAA

5

Southwest quadrant of the area AAA

6

Western half of the area AAA

7

Northwest quadrant of the area AAA

8

Northern half of the area AAA

9

Rest of the area AAA

Group 3

1GDFmWm

G: Forecast period

D: Direction from which the wind is blowing

Fm: Wind speed

Wm: Forecast weather

Group 3

GCode

Forecast PeriodDescriptive

DCode

WindDirection

FmCode

WindKnots

WmCode

Forecast Weather

0

Beginning of period

0

Calm

0

0 - 10

0

Moderate to good visibility (greater than 5 km)

1

Valid for 3 hrs

1

Northeast

1

11 - 16

1

Risk of accumulation of ice on superstructures

2

Valid for 6 hrs

2

East

2

17 - 21

2

Strong risk of accumulation of ice on superstructure

3

Valid for 9 hrs

3

Southeast

3

22 - 27

3

Mist (visibility 1 – 5 km)

4

Valid for 12 hrs

4

South

4

28 - 33

4

Fog (visibility > 1 km)

5

Valid for 18 hrs

5

Southwest

5

34 - 40

5

Drizzle

6

Valid for 24 hrs

6

West

6

41 - 47

6

Rain

7

Valid for 48 hrs

7

Northwest

7

48 - 55

7

Snow, or rain and snow

8

Valid for 72 hrs

8

North

8

56 - 63

8

Squally weather with or without showers

9

Occasionally

9

Variable

9

64 +

9

Thunderstorms

Group 4

2VSTxTnM

V: Visibility

S: State of the sea

Tx: Maximum air temperature

Tn: Minimum air temperature

Group 4

VCode

Visibility

SCode

State of the SeaDescriptive

Height(meter)

Tx,TnCode

Temperature(degrees Celsius)

0

Less than 50m

0

Calm

0

0

Less than -10

1

50 – 200m

1

Calm

0 – 0.1

1

-10 to -5

2

200 – 500m

2

Smooth

0.1 – 0.5

2

-5 to -1

3

500 – 1000m

3

Slight

0.5 – 1.25

3

About 0

4

1 – 2km

4

Moderate

1.25 – 2.5

4

1 to 5

5

2 – 4km

5

Rough

2.5 – 4.5

5

5 to 10

6

4 – 10km

6

Very rough

4 – 6

6

10 to 20

7

10 – 20km

7

High

6 – 9

7

20 to 30

8

20 – 50km

8

Very high

9 – 14

8

Greater than 30

9

50km +

9

Phenomenal

&lt; 14

9

Not forecast

Group 5

3DkPwHwHw

Dk: Direction from which swell is moving

Pw: Period of waves

HwHw : Height of forecast waves, in units of 0.5 metres

Group 5

DkCode

Direction from which the swell is moving

PwCode

Period of wavesIn seconds

0

Calm

0

10

1

Northeast

1

11

2

East

2

12

3

Southeast

3

13

4

South

4

14 or more

5

Southwest

5

5 or less

6

West

6

6

7

Northwest

7

7

8

North

8

8

9

Variable

9

9

/

Calm or not determined

Note 1: MAFOR groups 4 and 5 are not included in the Canadian MAFOR bulletins issued by the Meteorological Service of Canada and are being provided for reference purposes only. This is consistent with the World Meteorological Organization's coding regulations for the MAFOR bulletins.